Step 1: Understanding the Question:
The task is to identify the physical law that describes the temperature dependence of magnetic susceptibility in paramagnetic materials.
Step 2: Key Formula or Approach:
The relationship is given by:
\[ \chi \propto \frac{1}{T} \]
where \( \chi \) (chi) is magnetic susceptibility and \( T \) is the absolute temperature in Kelvin.
Step 3: Detailed Explanation:
Curie's Law applies primarily to paramagnetic substances.
At higher temperatures, thermal agitation increases, which disrupts the alignment of atomic magnetic dipoles with the external magnetic field.
Consequently, the susceptibility (the ease with which the material is magnetized) decreases as the temperature rises.
The formula is often written as \( \chi = \frac{C}{T} \), where \( C \) is the Curie constant.
Step 4: Final Answer:
The law is Curie's Law.